Light emitting module and automotive lamp

Abstract

A light emitting module includes a light emitting element, and a phosphor configured to emit visible light after being excited by the light emitted by the light emitting element. The light emitting element is structured such that the peak wavelength of the light, emitted by the light emitting element immediately after the start of an operation of the light emitting element, is shorter than that of an excitation spectrum for the phosphor, and the peak wavelength of the light emitted by the light emitting element is shifted toward that of the excitation spectrum for the phosphor with an increase in the temperature of the element due to its operation.

1 . A light emitting module comprising:
 a light emitting element; and   a phosphor configured to emit visible light after being excited with the light emitted by the light emitting element, wherein the light emitting element is structured such that the peak wavelength of the light, emitted by the light emitting element immediately after the start of an operation of the light emitting element, is shorter than that of an excitation spectrum for the phosphor, and the peak wavelength of the light emitted by the light emitting element is shifted toward that of the excitation spectrum for the phosphor with an increase in the temperature of the element due to its operation.   
     
     
         2 . The light emitting module according to  claim 1 , wherein the light emitting element is a light emitting diode in which, when the temperature of the light emitting element is in a steady state due to a continuous operation, the peak wavelength of the light emitted by the light emitting element is structured so as to match that of the excitation spectrum for the phosphor. 
     
     
         3 . The light emitting module according to  claim 1 , wherein the light emitting module is a light emitting diode emitting blue light, and wherein the phosphor is a yellow phosphor whose excitation spectrum contains the peak wavelength of the blue light. 
     
     
         4 . The light emitting module according to  claim 2 , wherein the light emitting element is a light emitting diode emitting blue light, and wherein the phosphor is a yellow phosphor whose excitation spectrum contains the peak wavelength of the blue light. 
     
     
         5 . An automotive lamp comprising:
 the light emitting module according to  claim 1 ; and   a radiating member in which the light emitting module is to be mounted.